There must have been some magic, in that old straw hat they found, for when they placed it on his head...
11 seconds sound clip from the Frosty's Winter Wonderland movie soundboard.
You can hear this line at 00:00:09.608 in the Blu-ray version of the movie.
Quote context
[...]
- Ah. He's not gonna come to life.
- Of course not. He's not Frosty the Snowman.
- Only the real Frosty can come to life.
- Gee, I wish he'd come back from the North Pole.
- Yeah, it's not warm here anymore. He wouldn't melt.
- He said he'd come back again someday. I wonder if he really meant it.
- Well, certainly he meant it.
- You all remember that day Frosty left.
[...]